Honestly, is it a possibility that it was put in there? Yes. Is it wrong for people to see that it could be real? No.

As a composer and arranger myself, I think the real problem is with the people who say "it's all crap" in some form or another. Even if the musical notes aren't really there, musicians see music everywhere. Are you going to say I'm crap and call BS on me if I write a piece of music based on the shape of a circle? Or say I'm retarded and should be killed because I compose a piece of music based on the patterns I perceive coming from a waterfall? No.

So, a guy saw the bread as music. It's no different from those painters who splatter paint on a canvas, and then step back and go "huh...I just got an idea for a painting using this to start". It's something pre-existing that someone is looking at it from a different vantage point. And it's not the generally accepted vantage point, so everybody claims controversy. No, he's just looking at it from a musical perspective.

And besides, da Vinci played the Lute and put music into all his works. They are all forms of art.